VIVITAR 75-260 F4.5 on a Canon DSLR Question

My sister has a couple of old Vivitar lenses from when she took photography classes years ago. One of these is the VIVITAR 75-260 F4.5 and the other is the 70-210. They both are in excellent condition as she decided later to start a bakery and buried the lenses into the back of a closet. I believe she mentioned the lenses were used on a Canon AE-1.
My question is, what type of adapter would be needed to use the lenses on a modern day Canon DSLR such as the 1D MII or 7D?
Would I need to worry about distance between the mirror and lens and any possible mishaps due to the crop factor (1.3) and (1.6) of those particular bodies?
Thanks for any info you fellow POTN members can provide.

If they really are Canon FD mount, then I wouldn't bother. The adapters needed to use FD lenses on EOS require corrective optics to focus beyond a short distance, because the register distance for FD is slightly shorter than for EF. That means adapters effectively become short extension tubes unless additional glass is used. You can use adapters without optics for close-up work, but this isn't really worth it unless the lens is good at close distances.

The 75-260 almost certainly isn't worth the trouble, but if the 70-210 is the Series 1, you might consider it. For an example, this was shot using a Series 1 70-210/3.5 in FD mount with a glass-less adapter.

Thanks for the reply. That's a good close up picture. I'll check with my sister to see which 70-210 she has. I thought it might be worth a shot to pick up an adapter for the lens since she would give me the lenses if I could use them.

Thorrulz wrote in post #11121725
My sister has a couple of old Vivitar lenses from when she took photography classes years ago. One of these is the VIVITAR 75-260 F4.5 and the other is the 70-210. They both are in excellent condition as she decided later to start a bakery and buried the lenses into the back of a closet. I believe she mentioned the lenses were used on a Canon AE-1.
My question is, what type of adapter would be needed to use the lenses on a modern day Canon DSLR such as the 1D MII or 7D?
Would I need to worry about distance between the mirror and lens and any possible mishaps due to the crop factor (1.3) and (1.6) of those particular bodies?
Thanks for any info you fellow POTN members can provide.

There are a number of "FD to EOS" adapters available. There are two different types. One contains a correction lens that allows focus to infinity. The other is usually called a "macro adapter", and contains no correction lens and will not allow focus to infinity.

Canon did make an "FD-EOS Converter", but they are extremely hard to come by, very expensive and fit only selected Canon "L" lenses (the long telephotos). These were sold only through Canon Professional Services. These also contained a correction lens to allow focus to infinity. I've seen these go on ebay for $1000.

The aftermarket adapters are all over the board for image quality as the glass is of mostly questionable quality. I did have several that I used with my old FD 300 2.8 manual focus "L" lens. None delivered the IQ the lens itself was capable of delivering.

If you want to adapt only for macro, and sacrifice infinity focus, it's worth a shot in my opinion.